I rescued this plant from a landfill in Johannesburg, South Africa. It has taken well in my garden and is blooming in just the second season that it's been here.
When I rescued it, I thought it was Agapanthus. But the flower is not right. My mom suggested it may be Amaryllis, but the flower and the flower stalk are not right. The stamens are attached to the edges of the petals, they do not come up the centre of the flower as do Amaryllis, and the flower stalk is flattened, it is not as round as Amaryllis.
p.s. It's Spring here, that may help with identification.